Add a big assert making sure 2 address instructions are formed right

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5057 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegAllocSimple.cpp b/lib/CodeGen/RegAllocSimple.cpp
index 97b42b0307ac881ba3c80a4b12d5a7f2c89c2d47..17b1044c5ce9efa53db09981099e7854563f0762 100644 (file)
--- a/lib/CodeGen/RegAllocSimple.cpp
+++ b/lib/CodeGen/RegAllocSimple.cpp
@@ -379,6 +379,12 @@ void RegAllocSimple::AllocateBasicBlock(MachineBasicBlock &MBB) {
             if (TM.getInstrInfo().isTwoAddrInstr(MI->getOpcode()) && i == 0) {
               // must be same register number as the first operand
               // This maps a = b + c into b += c, and saves b into a's spot
+              assert(MI->getOperand(1).isRegister()  &&
+                     MI->getOperand(1).getAllocatedRegNum() &&
+                     MF->getRegClass(virtualReg) ==
+                       PhysRegClasses[MI->getOperand(1).getAllocatedRegNum()] &&
+                     "Two address instruction invalid!");
+
               physReg = MI->getOperand(1).getAllocatedRegNum();
             } else {
               physReg = getFreeReg(virtualReg);